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Midland emergency radios: choose ER310, ER310PRO or ER40 by power and features

By the Plain Prepper editors. Updated 2026-10-17.

We research products from makers' specs, manuals and safety agencies; we do not run hands-on tests. Links to Amazon may earn us a commission at no cost to you. How this works.

Quick answer

Choose ER310 for micro-USB input, solar/crank charging and a six-AA backup option. It already includes an SOS flashlight beacon and backlit LCD. Choose ER310PRO for USB-C, Bluetooth and a temperature display, or compare ER40 for its documented combination of a backlit LCD, SOS beacon and USB phone output. The ER310 suspends radio and alert reception while charging an external device; do not rely on it for simultaneous phone charging and alerts. AA batteries are sold separately.

Three Midland emergency radios compared

Radio	Power and connections	Features
ER310	Micro-USB input, solar/crank charging, rechargeable battery or six AA cells (separate); USB output	SOS beacon, backlit LCD; radio/alerts suspended during external-device charging
ER310​PRO	USB-C, solar/crank charging; USB-C device charging	Bluetooth, SOS strobe, temperature display
ER40	Crank/solar charging; USB mobile output	Backlit LCD and SOS beacon

These are feature choices, not a measured size or endurance ranking. No comparable model dimensions or weights are established here.

Why a weather alert radio, not just any radio

The National Weather Service runs NOAA Weather Radio All Hazards, a network of more than 1,000 transmitters that broadcasts warnings, watches, forecasts and other hazard information 24 hours a day, 7 days a week. It covers all 50 states and nearby coastal waters, and it carries non-weather emergencies too, such as chemical releases and AMBER alerts.

A normal AM/FM radio cannot hear it. The NWS says NOAA Weather Radio needs a special receiver that picks up its seven VHF frequencies, from 162.400 to 162.550 MHz. All three Midland radios here are sold as weather alert radios built to receive those broadcasts.

Ready.gov's basic disaster kit list includes a battery-powered or hand crank radio and a NOAA Weather Radio with tone alert.

Choose by how you will power it

The ER310 recharges its internal battery through micro-USB input, solar or crank. It can instead use six AA cells, which are separate and are not recharged by the radio. Its USB output is a different connection for external devices. The manual says external-device charging switches it into charge mode and suspends radio functions, including alert reception; use another alert source during that time.

Midland’s current ER310 product page and updated support article specify 3500 mAh. The same product page’s phone-charging FAQ still refers to 2600 mAh, so the maker material is not consistent across revisions. Check the supplied battery label and matching manual revision; an ER310 model name alone does not establish the delivered battery capacity.

The ER310PRO uses USB-C input and device charging, plus solar/crank charging. The ER40 lists crank/solar charging and USB mobile output. Do not infer input connector type or uninterrupted alert operation from the words USB phone charging.

Midland advertises up to 45 hours of normal use for ER310 and 200+ hours of radio use for ER310PRO. These differently described conditions are not a standardized endurance comparison or a prediction while charging a phone.

Light and signaling features

The ER310 already has an SOS flashlight beacon and a backlit LCD. The ER40 also lists a backlit LCD and SOS beacon. These are shared functions, not PRO-only additions. Consider the PRO for its documented Bluetooth streaming, USB-C connections and temperature display rather than assuming the older ER310 has no screen readable in darkness.

Other Midland models you may see

Midland also sells the ER210 and ER50 crank weather radios. The current ER210 product page lists 2600 mAh; older revision information differs, so verify the supplied battery and matching manual rather than transferring an older capacity or flashlight figure to every ER210. No lumen output is established here, and lux is not converted to lumens. Midland describes the ER50 as a weather-scan radio with crank, solar and rechargeable power.

Our earlier Amazon searches for those names surfaced other models first, so neither is a pick here. Check the exact model before ordering; the comparison above remains ER310, ER310PRO and ER40.

Set it up before the storm

NOAA Weather Radio broadcasts on seven VHF frequencies, and the National Weather Service says the network has more than 1,000 transmitters. Turn the radio on at home, run the weather scan so it finds your local station, and learn how its alert works while things are calm.

• Charge the battery fully, then check it every few months.
• Try the hand crank and the solar panel once so you know how they feel.
• Keep a charging cable with the radio for the USB charging models.
• Store it where everyone in the house can find it in the dark.

Where it fits in your kit

Keep one radio in the go bag and know where it is at home. Pair it with a flashlight, extra batteries and the rest of the kit Ready.gov lists. For a radio that sits on a nightstand and wakes you for alerts, see our weather radio guide, which covers Midland's tabletop models; for talking with family nearby, see our Midland GMRS radio guide.

What to look for when you buy

Questions people ask

What is the difference between the Midland ER310 and ER310PRO?

Both have SOS signaling. ER310 already has a backlit LCD, micro-USB input and a six-AA fallback. PRO adds USB-C, Bluetooth and a temperature display. Midland’s 45 normal-use hours and 200+ radio-use hours are not standardized comparative endurance results.

Can a Midland emergency radio charge my phone?

ER310 has USB output, but its manual says external-device charging suspends radio functions, including alert reception. Midland warns that some modern phones may draw too much power. PRO lists USB-C device charging and ER40 lists USB mobile output. A separate power bank avoids relying on ER310 for alerts while it charges a phone.

Do I need a weather alert radio for emergencies?

Ready.gov's basic kit includes a battery-powered or hand crank radio and a NOAA Weather Radio with tone alert. The NWS says NOAA Weather Radio needs a special receiver that can pick up its frequencies.

How do Midland crank radios charge?

ER310 recharges its battery through micro-USB input, solar or crank, or runs on six separate AA cells. Those AA cells are not charged by the unit. PRO lists USB-C, solar/crank charging; ER40 lists crank/solar charging. Device-charging output is distinct from charging the radio.

Sources

• ER310 Portable Emergency Crank Weather Radio (midlandusa.com), Midland Radio
• ER310PRO Portable Emergency Crank Radio with Power Bank (midlandusa.com), Midland Radio
• ER40 Portable Emergency Weather Alert Crank Radio (midlandusa.com), Midland Radio
• ER210 Portable Emergency Crank Weather Radio (midlandusa.com), Midland Radio
• ER50 Portable Emergency Weather Alert Crank Radio (midlandusa.com), Midland Radio
• NOAA Weather Radio All Hazards (weather.gov), National Weather Service
• Build A Kit, Ready.gov (maker page: www.ready.gov/kit)
• ER310 owner manual and power/USB limits (support.midlandusa.com), Midland Radio

Sources checked 2026-10-17.